Ferrofluid transducer

Details Ferrofluid transducer Ferrofluid transducer

1980-08-25

1982-11-30

Tudor, Harold J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367168, 310 26, H04R 1500

Patent

active

043618790

ABSTRACT:
An underwater sound generator composed of a ferrofluid contained within a toroidal container which has a rigid bottom and top and elastic cylindrical side walls. A coil of wire links the toroidal container and is adapted to be connected to a dc bias source to produce a biasing magnetic field, H.sub.BIAS, which drives the magnetization of the ferrofluid well into saturation. Two oppositely wound coils of wire respectively link the inner side wall and the outer side wall and are adapted to be connected in series to an ac signal source to produce a time-varying magnetic field, H.sub.AC, which modulates H.sub.BIAS. The wires are equally spaced in the volume occupied by the ferrofluid. The gradient of H.sub.AC in the radial direction provides the time-varying force on the ferrofluid. The resulting ferrofluid motion in the radial direction is transmitted through the outer elastic side wall to supply acoustic motion to the surrounding water.

REFERENCES:
patent: 3009131 (1961-11-01), Woodworth
patent: 3406302 (1968-10-01), Lanyi et al.
patent: 4223401 (1980-09-01), Parrssinen
patent: 4308603 (1981-12-01), Overby
"Application Of Ferrofluids As An Acoustic Transducer Material" by Dubbel NRL Report 4030, Dec. 4, 1979.

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